Adds trunk/talk folder of revision 359 from libjingles google code to

trunk/talk


git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/base/timeutils.h

@@ -0,0 +1,98 @@
+/*
+ * libjingle
+ * Copyright 2005 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_BASE_TIMEUTILS_H_
+#define TALK_BASE_TIMEUTILS_H_
+
+#include <time.h>
+
+#include "talk/base/basictypes.h"
+
+namespace talk_base {
+
+static const int64 kNumMillisecsPerSec = INT64_C(1000);
+static const int64 kNumMicrosecsPerSec = INT64_C(1000000);
+static const int64 kNumNanosecsPerSec = INT64_C(1000000000);
+
+static const int64 kNumMicrosecsPerMillisec = kNumMicrosecsPerSec /
+    kNumMillisecsPerSec;
+static const int64 kNumNanosecsPerMillisec =  kNumNanosecsPerSec /
+    kNumMillisecsPerSec;
+
+// January 1970, in NTP milliseconds.
+static const int64 kJan1970AsNtpMillisecs = INT64_C(2208988800000);
+
+typedef uint32 TimeStamp;
+
+// Returns the current time in milliseconds.
+uint32 Time();
+// Returns the current time in nanoseconds.
+uint64 TimeNanos();
+
+// Stores current time in *tm and microseconds in *microseconds.
+void CurrentTmTime(struct tm *tm, int *microseconds);
+
+// Returns a future timestamp, 'elapsed' milliseconds from now.
+uint32 TimeAfter(int32 elapsed);
+
+// Comparisons between time values, which can wrap around.
+bool TimeIsBetween(uint32 earlier, uint32 middle, uint32 later);  // Inclusive
+bool TimeIsLaterOrEqual(uint32 earlier, uint32 later);  // Inclusive
+bool TimeIsLater(uint32 earlier, uint32 later);  // Exclusive
+
+// Returns the later of two timestamps.
+inline uint32 TimeMax(uint32 ts1, uint32 ts2) {
+  return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1;
+}
+
+// Returns the earlier of two timestamps.
+inline uint32 TimeMin(uint32 ts1, uint32 ts2) {
+  return TimeIsLaterOrEqual(ts1, ts2) ? ts1 : ts2;
+}
+
+// Number of milliseconds that would elapse between 'earlier' and 'later'
+// timestamps.  The value is negative if 'later' occurs before 'earlier'.
+int32 TimeDiff(uint32 later, uint32 earlier);
+
+// The number of milliseconds that have elapsed since 'earlier'.
+inline int32 TimeSince(uint32 earlier) {
+  return TimeDiff(Time(), earlier);
+}
+
+// The number of milliseconds that will elapse between now and 'later'.
+inline int32 TimeUntil(uint32 later) {
+  return TimeDiff(later, Time());
+}
+
+// Converts a unix timestamp in nanoseconds to an NTP timestamp in ms.
+inline int64 UnixTimestampNanosecsToNtpMillisecs(int64 unix_ts_ns) {
+  return unix_ts_ns / kNumNanosecsPerMillisec + kJan1970AsNtpMillisecs;
+}
+
+}  // namespace talk_base
+
+#endif  // TALK_BASE_TIMEUTILS_H_